AN IMPROVED ASSUMED STRAIN SOLID SHELL ELEMENT FORMULATION WITH BUBBLE FUNCTION DISPLACEMENTS

A set of four-node solid shell element models based on the assumed strain formulation is considered here. The present study investigates the use of bubble function displacements and the assumed strain field. Careful selection of the assumed strain terms generates an element whose order of numerical integration does not increase even when the bubble function displacements are added. Results for the four-node element without any bubble function terms show sensitivity to element distortion. Use of the bubble functions greatly improves element performance.

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